Audio scrambling system for scrambling and descrambling audio signals
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United States of America Patent
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-
Apr 1, 1997
Grant Date -
N/A
app pub date -
Oct 12, 1994
filing date -
Oct 12, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scrambling system has a scrambling apparatus and a descrambling apparatus for scrambling and descrambling a digital audio signal having a plurality of 16-bit long sample data units. The scrambling apparatus has a detector for detecting, in each sample data unit, a meaningless portion which is a portion including the MSB and a meaningful portion which is a portion including the LSB, and applying scrambling only to the meaningful portion. Since the meaningless portion is not scrambled, no error data will appear in the meaningless portion. Thus, an unexpected abrupt change in sound caused by a bit error in the meaningless portion which has bits with greater weighted value can be avoided.
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